CVE-2026-39834: Go Int Truncation In Comparison

When comparing an `int` variable (like a length/size) by casting it to a 32-bit or smaller type (e.g., `uint32`), large values on 64-bit platforms can silently truncate if they exceed the smaller type's capacity (e.g., a multiple of 2^32 evaluates to 0). This can lead to logic bugs, infinite loops, or buffer overflows. Safely compare by casting operands to `

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greprules fetch cve-2026-39834-go-int-truncation-in-comparison --engine opengrep

Description

When comparing an `int` variable (like a length/size) by casting it to a 32-bit or smaller type (e.g., `uint32`), large values on 64-bit platforms can silently truncate if they exceed the smaller type's capacity (e.g., a multiple of 2^32 evaluates to 0). This can lead to logic bugs, infinite loops, or buffer overflows. Safely compare by casting operands to `